#iot-div5{background-color:white;z-index:2;position: fixed;bottom: 0;text-align: center;aspect-ratio: 8/1;border-top: solid 1px;font-size: 0.1rem;justify-content:space-around;display: flex;align-items: center;} /*align-items:center与display:flex配合上下居中对齐*/
		a{text-decoration: none;color: black;}
		#iot-div5>div{width: 25%;aspect-ratio: 8/1;}
		#iot-div5>div>a>i{font-size: 0.25rem;}
		#iot-div5>div>i{font-size:0.25rem;}